SANTA CLARA -- Cornellius "Tank" Carradine fully plans to shore up the 49ers defensive line this season, a scenario hinging on his recovery from a Nov. 24 knee injury that made him available for the 49ers to draft in the second round Friday.

Only 135 days after undergoing surgery on a torn anterior cruciate ligament in his right knee, Carradine worked out Saturday for NFL teams, including the 49ers. He believes his 4.75-second time in the 40-yard dash, along with his fluid movement in other drills, supports his belief that he's healthy.

"There's nothing wrong with my knee, and there are no long-term things that could go on, because I'm healthy," Carradine said on a conference call with Bay Area media.

"I can run full speed. It's the first injury I've ever had. I'm 4½ months out of surgery, and I'm doing as good or better as anybody who's nine months out."

Although he has no intentions of being a "medical redshirt" as a rookie, Carradine conceded that the 49ers' doctors will determine his timeline.

Carradine racked up 11 sacks before his senior season at Florida State was cut short.

Rather than make the second pick (34th overall) in the second round Friday, the 49ers traded down with the Tennessee Titans and took Carradine six spots later. The 49ers received the Titans' second-round pick (No. 40) and a seventh-round choice (216th overall), as well as a 2014 third-round pick.

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Carradine (6-foot-4, 276 pounds) adds depth to a defensive front that struggled late last season after injuries to Justin Smith (triceps) and Aldon Smith (labrum).

Jed York, the 49ers CEO, tweeted: "Wish you could listen to Jimmy T (defensive line coach Jim Tomsula) talking to our newest Niner. Fired up doesn't begin to describe either side of the phone."

Tomsula had dinner with Carradine last Friday night before the impressive workout in his native Cincinnati. Carradine produced 26 sacks in two seasons at Butler Community College (El Dorado, Kansas) before transferring to Florida State.

Carradine was "kind of shocked" he did not get drafted in the first round, but he praised the Indianapolis Colts' selection at No. 24 overall of fellow Seminoles lineman Bjoern Werner.

"I knew I had an injury that was serious, but I was able to come back fast, and to run fast in the 40 and move around and show what I could do, it kind of shocked me," Carradine said. "But I got over it. I knew a team would take a chance on me in the second round."

The 49ers opened free agency last month by signing former Chiefs defensive lineman Glenn Dorsey. Defensive coordinator Vic Fangio told 95.7 The Game that Dorsey and Ian Williams could replace Isaac Sopoaga (Eagles) at nose tackle, a position that was on the field only about 36 percent of the snaps.

Before Carradine's selection, Fangio said: "Would we like another defensive lineman? Yeah, everybody would. But I don't see it as a crying need at this point."

Carradine said his mother gave him the nickname "Tank" when he was young. "I had a little army tank with me," and I couldn't go anywhere without it," he said. "I tried to push people over with it."

The 49ers' first draft pick also came after a trade, as they moved up 13 spots Thursday night to take LSU safety Eric Reid 18th overall.